21475372057 has 16 divisors (see below), whose sum is σ = 22235428224. Its totient is φ = 20725200000.

The previous prime is 21475371991. The next prime is 21475372069. The reversal of 21475372057 is 75027357412.

It is a cyclic number.

It is not a de Polignac number, because 21475372057 - 2¹⁹ = 21474847769 is a prime.

It is a super-2 number, since 2×21475372057² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21475372957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4249182 + ... + 4254232.

It is an arithmetic number, because the mean of its divisors is an integer number (1389714264).

Almost surely, 2^21475372057 is an apocalyptic number.

It is an amenable number.

21475372057 is a deficient number, since it is larger than the sum of its proper divisors (760056167).

21475372057 is a wasteful number, since it uses less digits than its factorization.

21475372057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000.

The product of its (nonzero) digits is 411600, while the sum is 43.

The spelling of 21475372057 in words is "twenty-one billion, four hundred seventy-five million, three hundred seventy-two thousand, fifty-seven".